Harris says the album will feature "mainly covers," though the duo also considered some of the songs Crowell wrote for others but never recorded himself. "It's kind of a crazy quilt of material," says Harris, who prefers to keep song list specifics "under my hat" for the time being.

Harris and Gill also make guest appearances on Crowell's June 5 release, "Kin," a collection of songs Crowell wrote with author Mary Karr.